Bite of the Werebear

With an inhuman roar, your face extends and expands, and your hands enlarge into clawed paws. Powerful muscle builds under your skin, and you become a half-bear creature.

(Spell Compendium, p. 27)
Originally posted on D&D tools

Transmutation
Level: Druid 6, Sorcerer, Wizard 7,
Components: V, S, M,
Casting Time: 1 Standard Action
Range: Personal
Target: You
Duration: 1 round/level
Saving Throw: No
Spell Resistance: No

You gain a +16 enhancement bonus to Strength, a +2 enhancement bonus to Dexterity, a +8 enhancement bonus to Constitution, and a +7 enhancement bonus to natural armor. Your hands become claws, granting you two claw attacks, and your mouth becomes that of a bear, giving you a bite attack. You can attack with both claws at your full attack bonus, but your bite attack takes a -2 penalty (as if you had the Multiattack feat). Each claw deals 1d8 points of damage (1d6 if you are Small) + your Strength modifier, and your bite deals 2d8 points of damage (2d6 if you are Small) + 1/2 your Strength modifier. You gain the benefits of the Blind-Fight and Power Attack feats, as well. If your base attack bonus is +6 or higher, you do not gain any additional attacks.

Material Component: A tuft of bear fur.